I've been wanting to built Arcana in Minecraft for a while, but could never quite manage all those circles. This and Portals are my favourites, overall. Given a bunch of practice and this contest as incentive, and I did it! Of course, I realized after the fact that someone won last year doing Arcana, so this isn't eligible for a prize this year.
I hope people like it: I certainly enjoyed doing it.
Thank you to my wife Jenna, who introduced me to Digital Blasphemy and enjoys Minecraft too.